Expansion-bolt.



J. KENNEDY. EXPANSION BOLT. APPLmATIoN FILED MAY 11 Patented Sept 29, 1914.

gunnunu mi? f3 f4 .ze e0 INVENTOR /f/ 5W O l 000000000 o O '00 WITNESSES -v To all whom it may concern: A

chers for bolts in brick or angles to that in-which the section of Fig. 6

` expansion 'the bolt and Figs.

. shown in Figs. 6',

'metal, the outer surface of which is cylln- UNTTED sTATEs PATENT oEEIcE.

. JOSEPH KENNEDY, F NEW YORK, N. Y., ASSIGNOR 'IOl THE'CLEMENTSCOMPANY, A

' CORPORATION OIE' NEW YORK.

EXPANSION-BOLT.

112,411 specification of Letters Patent. Patented Sept. 1914.

Application led May 11, 1912. Serial No. 696,674.

. diameter of the bolt 13 which is to be used with this device, and the diameter at the other end 14 of the frustum smallcrthan that of the b olt. This frustum extends through substantially one-half the length of the shell 10. A section tak/en through this part of the shell is shown in Fig; 3 In the other half of the shell the opening is somewhat similar, but the vline which generates the cone; rotates about an ellipse so that' a cross-section taken at any part thereof will be oval in formas isshown in Fig. 2. The rear half of the shell in hich is this elliptical cone-like frustum, s divided by oppositely disposed longitudinal slits 16 along the major axis of the cone.

17 is an internally threaded expander into. which the threads of the bolt 13 t. Its outer surface is also in the form of the'frustumof an elliptical cone and ts the opening 15.

Before describing the modification which is illustrated in the other figures of the drawings, I will describe Vthe operation of .v this device.

wise .formedV in ther structure to bolt is to be slightly larger the shell 10.

Be it known that I, JOSEPH KENNEDY, a citizen of the llnited States, and a resident4 of the city, county, and State of New Yorin' have invented certain new and useful Improvements in Expansion-Bolts, of which the following is'aspecification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to` improvements in. expansion bolts of the type employed as anstone walls, or the like, wherein the material of the wall is of a character not adapted to directly re' ceive and hold a threaded bolt.-

I will describe my invention in the following specification and point out the novel featuresy thereof in appended claims.

Referring to the drawings, Figure 1 is a longitudinal section of a bolt anchor or made according to my invention. Fig. 2 is a sectional end elevation of the device shown in Fig. 1 the section being taken on the line 2-2 of the latter figure and -F i g. 3 is a similar view taken on theline 3-3 of Fig. 1. Fig. 4: is a longitudinal section of the parts which are shown in Fig. 1, but in this case the bolt is inserted through the central part of the device. Fig. 5 is a simwhich the fastened. This hole is but than the outside diameter of The latter is then placed in ilar View with the bolt screwed farther into `this hole and the bolt 13 screwed into it. the device and with the latter in its ex- As the metal ofthe shell is softer than panded condition. Ihaveishown a modified that of the'bolt, the threads of the latter will cut into 1t and form threads for the bolt. As the latter is turned it will -be forced farther'into the shell and will at the same time force the metal of the shell f1. The expan sion thus produced will cause the shell to engage the inner walls of the hole and will hold' the shell in place.- Further rotation of the bolt will bring it into the expander V17 and as the threads which thebolt has cut in the shell will prcventthe bolt slipping through the shell, there will be n o longitudinal movement of the expander until after the end of the bolt 13 has reached the bottom ofthe hole or engaged the exterior v support upon which the bolt is being used. Thereupon the longitudinal movement of the expander will Yopen up' the inner end'of the shellI 10 and force it tightly into .engagement with the wall fof the hole to effect the v' The embodiment form of my invention in the remaining figures o f the drawing of which Fig. 6 is a longitudinal section of the device without 7 and8"sirnilar views but with the section taken in'a plane at right outward as shown in Fig is taken, with the bolt lpartially inserted in Fig. 7 and wholly inserted in Fig. 8. Figs. 9 and 10 'are sectional end views of the parts 7 and 8 the sections being taken on the lines- 9-9 and 10-10 respectively of Fig. 7 Like characters vof reference designate corresponding parts in all of the figures. I 10 designates alhollow shell of a soft drical. Inside this shell is constructed with twotapering longitudinal openingsor holes which converge fromthe ends yof the shell toward the center where they meet. VThe opening 11 at the front end is in the form of the 'frustum of a cone with the diameter of the base at 12 slightly greater than the l v g illustrated 1n Figs. 6 to A holeA is drilled or other.

the head of the bolt hasl vof the wall or other;

final and principal anchorage of the bolt.

inclusive, comprises a cylindrical shell 20 similar to the shell 10, provided with a pair i of opposed slits or divisions 22 extending the expa'nder forward and longitudinally from the inner or rear end of the shell to about midway its length. The bore of the shell is composed in this case of two tapered sections 24, 25 converging from their -ends toward the middle of the shell, and having their inner ends of less diameter than the diameter of the bolt for which the expansion is adapted.

A pair of opposed double-wedge shaped enlargements 26 are formed in the rear half of the shell in the slits 22. These enlargements are adapted to receive correspondinglyshapedears or lugs 28 which project laterally from an internally threaded conical expander 30, the latter fitting the conical bore 24 of the shell 20. In/this form of the invention the ears 28 prevent the relative rotation Bof the expanderand the shell.

When the bolt is threaded through the shell it first encounters the restricted bore.

the threads of the bolt cutting into the soft'- metal of the shell and expanding the shell slightly as heretofore explained. Further inward movement of the bolt will cause its threaded end to enter the-expander 30, and when the end of the bolt strikes the bottom of the hole in which the shell is inserted or the bolt head engages the wall or other support the continued rotation of thefbolt draws the lugs 28 aid the conical body portion of the expander in expanding lthe shell 20.

What I claim is:

l. A bolt anchor comprising a tubular shell of soft material havin' a bore tapered in opposite directions an an internally threaded expander within said shell, the smallest diameter of the bor'e of said shell being less than the diameterl of the threaded portion of the expander.

2. A bolt anchor comprising a tubular shell of soft material having a bore tapered fin opposite directions `rial softer than that and an internally threaded expander Withinesaid shell shaped to vprevent relative rotation of the shell' therewith, the smallest diameter ofthe bore of said shell being less than the diameter of the threaded portion of the expander.

3. The combination of a bolt and a bolt anchor comprising a tubular shell of matcrial softer than that of thebolt, and an internally threaded expander within the shell shaped to prevent'relative rotation of the shell therewith, the bore of said shell having a portion of less diameter than that of the bolt and being arranged to be successively expanded by the bolt and by the expander.

4.4 The combination of abolt and a bolt anchor comprising a tubular shelll of mateof'the bolt and provided with a bore taperinfr from each end toward the middle of the shell, thesmallest diameter of said bore being less than that of the bolt whereby when the bolt is screwed into the shell an initial expansion is el'ected, and an internally threaded expander within the shell adapted to coperate with the bolt to produce the `final expansion.

5. The combination of a bolt and a bolt anchor comprising a tubular shell of material softer than the, bolt slit for a portion of its length, said shell having a bore tapered in opposite directions toward substantially the central portion thereof, the smallest diameter of said bore being less than that of the bolt, said slitbeing provided with a pair of oppositely disposed enlargements and an internally threaded conical expander within said shell having ears in said enlargements. I

In witness whereof, I have hereunto set my hand and seal this 9th day of May, 1912.

JOSEPH KENNEDY. [L s.)

Witnesses: Y

ELIZABETH AlnxANDER, I. B.A Moena. 

